@misc{indiciae267660066c31,
  title = {A generalized geologic map of Mars},
  author = {Carr, M. H. and Masursky, H. and Saunders, R. S.},
  year = {1973},
  url = {https://ntrs.nasa.gov/citations/19730023949},
  note = {Source identifier: 19730023949}
}